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I see. There's a pretty thorough discussion on a very similar situation here: http://moz.com/community/q/can-i-use-nofollow-tag-on-product-page-duplicated-content.  Everett endorsed Monica's answer with, "... you might consider putting a Robots Noindex,Follow meta tag on the product pages. You'll need to rely on category pages for rankings in that case, which makes sense for a site like this."  Monica's long term solution was to also work on getting specific user-generated content on as many product pages as possible. Cheers!

@JCP Vlemmix, Thx for your reply. I does however not entirely anwer my question. To my information Google may include the date in the snippet on the SERP. The date used can be the crawldate or a date mentioned on the webpage. I am not exactly sure how to influence the date shown in the snippet. I have pages that were created long time ago and are update regularly, by me and user comments. I would like this page to carry a recent date that is shown in the snippet on the SERP. For know I am going to run a test on a few pages in which I show the date on the webpage in a USA date format. If Google picks up this date i conitnue testing with updating this date on the webpage everytime the webpage is updated. How do you manage the date in the snippet?